Essentially a laboratory that orbits Earth, the International Space Station (ISS) is now 98 percent complete, and the countdown is underway for the liftoff of space shuttle Atlantis as it prepares to deliver a new science module to the ISS. Scheduled to launch on Friday, May 14 at 2:20 p.m. EST, this mission will be Atlantis’ last, and will put some of the finishing touches on the ISS